Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Maxime Chevallier <maxime.chevallier@bootlin.com>,
        Andrew Lunn <andrew@lunn.ch>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.20 55/76] net: dsa: mv88e6xxx: power serdes on/off for 10G interfaces on 6390X
Date:   Fri,  8 Mar 2019 13:50:07 +0100
Message-Id: <20190308124916.752024407@linuxfoundation.org>
In-Reply-To: <20190308124914.789210760@linuxfoundation.org>
References: <20190308124914.789210760@linuxfoundation.org>
User-Agent: quilt/0.65
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Maxime Chevallier <maxime.chevallier@bootlin.com>

[ Upstream commit d235c48b40d399328585a68f3f9bf7cc3062d586 ]

Upon setting the cmode on 6390 and 6390X, the associated serdes
interfaces must be powered off/on.

Both 6390X and 6390 share code to do so, but it currently uses the 6390
specific helper mv88e6390_serdes_power() to disable and enable the
serdes interface.

This call will fail silently on 6390X when trying so set a 10G interface
such as XAUI or RXAUI, since mv88e6390_serdes_power() internally grabs
the lane number based on modes supported by the 6390, and returns 0 when
getting -ENODEV as a lane number.

Using mv88e6390x_serdes_power() should be safe here, since we explicitly
rule-out all ports but the 9 and 10, and because modes supported by 6390
ports 9 and 10 are a subset of those supported on 6390X.

This was tested on 6390X using RXAUI mode.

Fixes: 364e9d7776a3 ("net: dsa: mv88e6xxx: Power on/off SERDES on cmode change")
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/dsa/mv88e6xxx/port.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -405,7 +405,7 @@ int mv88e6390x_port_set_cmode(struct mv8
 			return err;
 	}
 
-	err = mv88e6390_serdes_power(chip, port, false);
+	err = mv88e6390x_serdes_power(chip, port, false);
 	if (err)
 		return err;
 
@@ -421,7 +421,7 @@ int mv88e6390x_port_set_cmode(struct mv8
 		if (err)
 			return err;
 
-		err = mv88e6390_serdes_power(chip, port, true);
+		err = mv88e6390x_serdes_power(chip, port, true);
 		if (err)
 			return err;